The FOM-9 is a miniature sync/async fibre optic modem operating full or half duplex over fibre optic cable. It has a range of 15 km (9 miles) over single mode fibre and operates at selectable data rates up to 128 kbps.The FOM-9 includes a built-in BER tester that generates a 511-bit pattern and can be used for testing the link integrity. Diagnostic loopbacks according to ITU V.54 can be activated for fault isolation. Two types of diagnostic loops are supported: local analog loop and remote digital loop. The loopback options and the BER tester can be activated by toggling pin 18 or 21 on the V.24/RS-232 interface.When set to asynchronous mode, the modem internally converts the transmission to synchronous format, in compliance with the ITU V.14 standard.The FOM-9 includes innovative circuits that allow operation without external power, by drawing low power from the DTE data and control signals. In cases where the DTE cannot provide enough power, the FOM-9 includes a special jack that can be connected to an external AC power supply adapter.The modem has six LED indicators to display the status of the modem: TD, RD, DCD, RTS, TEST, and ERR. 
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